The optical wavelength converter can be used to increase the transmission bandwidth and transmission distance of the network. It can make the network capacity increase exponentially and quickly without affecting the original business, and greatly improve the security of the network. It has functions such as optical relay, wavelength conversion, and transmission medium conversion between single-mode fiber and multi-mode fiber. It is suitable for multiplexing transmission and wavelength conversion of various digital signals (SDH, ATM, Ethernet, Fibre Channel) and analog signals in optical fiber in the range of 10Mb / s to 2.5 Gb / s.